Im doing a higher then average dose of d-bol and have horrible backpumps. I cant even stand up for 5 minutes without it thumping. Ive only been on d-bol for about a week and a half but am going to have to drop the dose. Now my question is, does anyone know what exactly causes these it or has any scientific evidence pointing to what causes back pumps. Im just really curious what causes it because i have no idea at all.